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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55d74d407b7296aac0c74ea9ac5838cd7bb87e04f054ec76d3f88d48c2c9a1d' 
  AND token = 'b8feY0fBSJKr5aTF37ILM/eLzVqQYIKNc0vSeHlo0UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}